Re: [PATCH v9 00/24] x86/resctrl: monitored closid+rmid together, separate arch/fs locking

[Thomas Gleixner <tglx@linutronix.de>]

On Sat, Feb 17 2024 at 11:55, Borislav Petkov wrote:

> On Tue, Feb 13, 2024 at 06:44:14PM +0000, James Morse wrote:
>> Hello!
>> 
>> It's been back and forth for whether this series should be rebased onto Tony's
>> SNC series. This version isn't, its based on tip/x86/cache.
>> (I have the rebased-and-tested versions if anyone needs them)
>
> The set applied ontop of tip:x86/cache gives:
>
> vmlinux.o: in function `get_domain_from_cpu':
> (.text+0x150f33): undefined reference to `lockdep_is_cpus_held'
> ld: vmlinux.o: in function `rdt_ctrl_update':
> (.text+0x150fbc): undefined reference to `lockdep_is_cpus_held'

Wants to be folded into patch 24.

Thanks,

        tglx
---
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -368,8 +368,8 @@ struct rdt_domain *get_domain_from_cpu(i
 	 * about locks this thread holds will lead to false positives. Check
 	 * someone is holding the CPUs lock.
 	 */
-	if (IS_ENABLED(CONFIG_LOCKDEP))
-		lockdep_is_cpus_held();
+	if (IS_ENABLED(CONFIG_HOTPLUG_CPU) && IS_ENABLED(CONFIG_LOCKDEP))
+		WARN_ON_ONCE(!lockdep_is_cpus_held());
 
 	list_for_each_entry(d, &r->domains, list) {
 		/* Find the domain that contains this CPU */